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openorbit's Introduction

README

Open Orbit

An open source interactive spacecraft simulator.

Licence

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program. If not, see http://www.gnu.org/licenses/.

Note, that some files in the program have a more permissive modified BSD license so that you can take these and use them without the GPL restrictions, if this is the case, the file’s header comment will say so.

Open Orbit is a free realistic and modular spacecraft simulator. The purpose is to let the user experience orbital space flight in a realistic manner.

The package that this read me is part of is the source distribution, this readme will give you pointers to where you find manuals, build instructions, documentation and so forth. This document should be used as an entry point for you, in order to help you get familiar with the open orbit source code, build procedures, plugin development and so forth.

For build instructions see INSTALL.txt For coding conventions see ./HACKING.org For the license see ./COPYING.txt For plugin development see PLUGINS.txt (not yet written)

The goal is to have the documentation written in Emacs org-mode syntax. This enables us to firstly read the docs as is, and secondly to publish the docs into HTML, PDF and other formats.

openorbit's People

Contributors

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openorbit's Issues

Add cairo text rendering

Current text rendering is based on core text, this results in portability issues. We should add support for using the cario when rendering text into textures.

Add barnes hut solver for gravity

For accurate gravity computations for each object, we should add a barnes hut solver. Note that this only makes sense when libcelmek has been integrated.

Solving gravity using barnes hut should be very efficient as celestial objects are not subject to gravity (but are sources of gravity), but use orbital models instead.

Add Qt5 based GUI

Although, we could keep on using SDL in the Linux port, this would complicate maintaining feature parity with the OS X version. For this reason we should move to Qt5 for the Linux GUI.

Qt5 is preferred over GTK in this case due to it being more portable and having better OpenGL support.

Replace SDL joystick support with other API

As the SDL GUI will be replaced with Qt, we need to ensure that we can handle joystick input without SDL as well.

We need to investigate which libraries are portable and good for this. An option would be the HID API.

Update rendering to OpenGL 3

Renderer is currently using OpenGL 2 and should be migrated to OpenGL 3.

This includes among other the following changes:

  • Get rid of all glPushMatrix / glPopMatrix calls
  • Implement custom functions for matrix management (most exist in the vmath library, but new matrix creation functions are needed).
  • Get rid of additional state management
  • Update shaders to use self named attributes instead of the deprecated gl_XYZ names which are no longer in OpenGL 3

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